During our study of evolution, we have referred to the platypus (Ornithorhynchus anatinus) often and much, as it represents one of nature's most odd and curious animals. The platypus also happens to represent what is thought to have been one of evolution's greatest puzzles--how is it possible to have a mammal that lays eggs, but has a bird's bill? And what about the fact that the platypus is the only mammal that produces venom?
Earlier this year, scientists working at several different research facilities uncovered the mystery of the platypus by revealing that they had sequenced the platypus genome. And lo, there was rejoicing! The researchers discovered what people had suspected all along...there was a bit of reptile DNA, a smattering of bird DNA and a whole heck of a lot of mammal DNA (more than 70%).
So why does this even matter? For one, it may give scientists a clue into the evolution of mammal species. It may provide increased evidence for a radiation of mammals from reptiles, as there is some evidence that demonstrates that mammals evolved from primitive reptiles.
What is most amazing is how scientists were able to show a link between reptiles and mammals using genome research. In the past, fossil records and homologous structures were relied upon, as DNA science was primitive and not nearly as refined or as widely used as it is today. Now, with the advances in genomics/proteomics research, scientists can derive more exact relationships between seemingly unrelated organisms.
So...all of this begs a few questions: what impact does genomics research have on uncovering relationships between species? How will genomics research change what we already know about the relationships that exist among extant species? How will genomics research change what we think we know about relationships among species? How could what we've learned about the platypus help us to understand more about our own human species?
Posted by scienceguru on October 12, 2008
Tags discuss, evolution, genomics is a cool branch of biology, nature is strange sometimes


Comments on specific paragraphs:
Click the
icon to the right of a paragraph
Comments on the page as a whole:
Click the
icon to the right of the page title (works the same as paragraphs)